I built an extension to use PBKDF2 and some other cleverness to generate predictable passwords for websites because I was tired of needing "random" passwords for every site and some kind of password keeper that stored them. I'd rather generate the password when I need it, and to do so from a password I have memorized, but which isn't written down or used anywhere else.

I'm using

  cat /dev/urandom |base64 |head -c20 && echo